Add "Unarchive All Chats" and Bulk Chat Management Options

Hey @vin10! This is a really practical suggestion. If someone accidentally archives a lot of chats, restoring them one at a time can get tedious pretty quickly. Bulk actions like Unarchive All, selecting multiple chats, or unarchiving/deleting selected chats would make the Archived Chats page much easier to manage. A confirmation step also makes sense to help prevent accidental changes. I can’t share a timeline right now, but I’ll pass this feedback along internally. - Sunny